When you think of contortionists, images of circus performers (perhaps a la Cirque du Soleil) likely come to mind. The bending, twisting, and stretching seem impossible — and never fail to mesmerize.

This year marks 250 years since the start of modern circus. It was in 1768 that Philip Astley began his circus entertainment in Waterloo in London. To celebrate, here's the latest in our new series of ...